RT2515A
Typical Application Circuit
RT2515A
V
IN
C1
10µF
Chip Enable
2
ADJ 7
EN
R2
GND
8,
9 (Exposed Pad)
(V)
3
VIN
VOUT
6
R1
C2
10µF
Chip Enable
RT2515A
V
OUT
V
IN
C1
10µF
3
VIN
VOUT
6
C2
10µF
V
OUT
1.2V
2
ADJ 7
EN
GND
8,
9 (Exposed Pad)
V
OUT
=
0.5(R1+R2)
R2
Figure 1. Adjustable Voltage Regulator
Figure 2. Fixed Voltage Regulator
Functional Pin Description
Pin No.
1, 4, 5
2
Pin Name
NC
EN
Pin Function
No Internal Connection.
Chip Enable (Active-High). Pulling this pin below 0.4V turns the regulator off,
reducing the quiescent current to a fraction of its operating value. The device will
be enabled if this pin is left open. Connect to VIN if not being used.
Input voltage. For regulation at full load, the input to this pin must be between
(V
OUT
+ 0.5V) and 5.5V. Minimum input voltage is 1.4V. A large bulk capacitance
should be placed closely to this pin to ensure that the input supply does not sag
below 1.4V. Also a minimum of 10μF ceramic capacitor should be placed directly at
this pin.
Output Voltage. A minimum of 10μF capacitor should be placed directly at this pin.
When this pin is grounded, an internal resistor divider sets the output voltage to
1.2V. If connected to the VOUT pin, the output voltage will be set at 0.5V. If
external feedback resistors are used, the output voltage will be determined by the
resistor ratio.
Ground. The exposed pad must be soldered to a large PCB and connected to GND
for maximum power dissipation.
3
VIN
6
VOUT
7
ADJ
8,
GND
9 (Exposed pad)
Function Block Diagram
R
SENSE
VIN
V
PUMP
-
+
+
VOUT
-
+
Mode
Select
ADJ
V
IN
0.5µA
EN
Thermal
Shutdown
V
OUT
V
IN
+
-
-
0.5V
V
IN
Reference
Generator
0.1V
GND
Reverse Voltage
Shutdown
Copyright
©
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS2515A-02 November 2012
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
